curl --request POST \
  --url https://api.veryfront.com/conversations/{id}/participants \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "userId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "role": "member"
}
'

{
  "id": "<string>",
  "conversationId": "<string>",
  "role": "<string>",
  "notificationPreference": "<string>",
  "joinedAt": "<string>",
  "userId": "<string>",
  "lastReadMessageId": "<string>"
}